feat: implemented handlers

cmd/muxing/muxing.go

@@ -2,6 +2,7 @@ package main
 
 import (
 	"fmt"
+	"io"
 	"log"
 	"net/http"
 	"os"
@@ -17,12 +18,66 @@ Feel free to drop gorilla.mux if you want and use any other solution available.
 main function reads host/port from env just for an example, flavor it following your taste
 */
 
+func NameHandler(w http.ResponseWriter, r *http.Request) {
+	vars := mux.Vars(r)
+	w.WriteHeader(http.StatusOK)
+	_, err := fmt.Fprintf(w, "Hello, %v!", vars["PARAM"])
+	if err != nil {
+		_ = fmt.Errorf("[NameHandler] Error: %w", err)
+	}
+}
+
+func BadHandler(w http.ResponseWriter, r *http.Request) {
+	w.WriteHeader(http.StatusInternalServerError)
+}
+
+func DataHandler(w http.ResponseWriter, r *http.Request) {
+	b, err := io.ReadAll(r.Body)
+	if err != nil {
+		_ = fmt.Errorf("[DataHandler] Error: %w", err)
+		return
+	}
+
+	w.WriteHeader(http.StatusOK)
+	_, err = io.WriteString(w, fmt.Sprintf("I got message:\n%v", string(b)))
+	if err != nil {
+		_ = fmt.Errorf("[DataHandler] Error: %w", err)
+	}
+}
+
+func HeadersHandler(w http.ResponseWriter, r *http.Request) {
+	h := r.Header
+	a, err := strconv.Atoi(h.Get("a"))
+	if err != nil {
+		_ = fmt.Errorf("[DataHandler] Error: %w", err)
+		w.WriteHeader(http.StatusInternalServerError)
+		return
+	}
+	b, err := strconv.Atoi(h.Get("b"))
+	if err != nil {
+		_ = fmt.Errorf("[DataHandler] Error: %w", err)
+		w.WriteHeader(http.StatusInternalServerError)
+		return
+	}
+	sum := a + b
+
+	fmt.Println(fmt.Sprintf("%d", sum))
+
+	w.Header().Add("a+b", fmt.Sprintf("%d", sum))
+	w.WriteHeader(http.StatusOK)
+}
+
 // Start /** Starts the web server listener on given host and port.
 func Start(host string, port int) {
-	router := mux.NewRouter()
+	r := mux.NewRouter()
+
+	r.HandleFunc("/name/{PARAM}", NameHandler).Methods("GET")
+	r.HandleFunc("/bad", BadHandler).Methods("GET")
+	r.HandleFunc("/data", DataHandler).Methods("POST")
+	r.HandleFunc("/headers", HeadersHandler).Methods("POST")
 
 	log.Println(fmt.Printf("Starting API server on %s:%d\n", host, port))
-	if err := http.ListenAndServe(fmt.Sprintf("%s:%d", host, port), router); err != nil {
+	if err := http.ListenAndServe(fmt.Sprintf("%s:%d", host, port), r); err != nil {
 		log.Fatal(err)
 	}
 }

go.mod

@@ -2,14 +2,4 @@ module github.com/GolangUnited/helloweb
 
 go 1.17
 
-require (
-	github.com/gorilla/mux v1.8.0
-	github.com/pkg/errors v0.9.1
-	github.com/stretchr/testify v1.7.0
-)
-
-require (
-	github.com/davecgh/go-spew v1.1.0 // indirect
-	github.com/pmezard/go-difflib v1.0.0 // indirect
-	gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c // indirect
-)
+require github.com/gorilla/mux v1.8.0

go.sum

@@ -1,15 +1,2 @@
-github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
-github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/gorilla/mux v1.8.0 h1:i40aqfkR1h2SlN9hojwV5ZA91wcXFOvkdNIeFDP5koI=
 github.com/gorilla/mux v1.8.0/go.mod h1:DVbg23sWSpFRCP0SfiEN6jmj59UnW/n46BH5rLB71So=
-github.com/pkg/errors v0.9.1 h1:FEBLx1zS214owpjy7qsBeixbURkuhQAwrK5UwLGTwt4=
-github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
-github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
-github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
-github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
-github.com/stretchr/testify v1.7.0 h1:nwc3DEeHmmLAfoZucVR881uASk0Mfjw8xYJ99tb5CcY=
-github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
-gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
-gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo=
-gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=